—I think teenagers should ___ to get their ears pierced.
—I agree with you.
A. are allowed             B. not be allowed            C. not allowed
B解析:
考查被動(dòng)語(yǔ)態(tài)。情態(tài)動(dòng)詞should的被動(dòng)結(jié)構(gòu)為should (not) be done結(jié)構(gòu)，故選B項(xiàng)。
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